import java.util.HashSet;
import java.util.LinkedHashSet;
import java.util.TreeSet;

/**
 * describe:
 *
 * @author helloworldyu
 * @data 2017/12/1
 */
public class TestSet {
	public static void main(String[] args) {
		HashSet<Integer> hashSet = new HashSet<>();

		LinkedHashSet<Integer> hashSet1 = new LinkedHashSet<>();

		TreeSet<Integer> treeSet = new TreeSet<>();
	}
}